Infrared spectral, variable-temperature magnetic susceptibility and Mössbauer spectral investigations on tris(carbodithioato) iron(III) complexes

Preparation of two thiophenophane polythioether macrocycles and 11 of their complexes of Cu(I), Cu(II), Ag(I), and Pd(II) is described. The single crystal X-ray structure of [(CuBr)2(L1)x is reported: space group Pcma, a = 8.7120(6), b = 10.7791(5), c = 12.0929(5) Å, Z = 2, Rf = 0.052, Rw = 0.036 for 521 reflections. Variable-temperature magnetic susceptibility measurements for [(CuCl2)2(L1)] and [(CuCl2)2(L2)] reveal weak antiferromagnetic and weak ferromagnetic coupling, respectively. Cyclic voltammograms of these compounds display two unequal waves in acetonitrile solvent but only one in nitromethane or dimethyl sulfoxide. 1H NMR spectra of {[(η-C3H5)Pd]2(L1)}{PF6}2 and {[(η-C3H5)Pd]2(L2)}{PF6}2 in various solvents show different temperature responses. These magnetic, electrochemical, and NMR effects are discussed in the light of structural differences at sites in the two ligands that are outside the coordination spheres. Key words: magnetic susceptibility, copper, thioether, electrochemistry.

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Supramolecular Assemblies of Trinuclear Copper(II)-Pyrazolato Units: A Structural, Magnetic and EPR Study

Chemistry ◽

10.3390/chemistry2030039 ◽

2020 ◽

Vol 2 (3) ◽

pp. 626-644

Author(s):

Kaige Shi ◽

Logesh Mathivathanan ◽

Radovan Herchel ◽

Athanassios K. Boudalis ◽

Raphael G. Raptis

Keyword(s):

Magnetic Susceptibility ◽

Solid State ◽

Dft Calculations ◽

Variable Temperature ◽

One Dimensional ◽

Frozen Solution ◽

Variable Temperature Magnetic Susceptibility ◽

Anionic Complexes ◽

Weak Ferromagnetic ◽

Exchange Parameters

Two anionic complexes, {[Cu3(µ3-OH)(µ-4-Ph-pz)3Cl3]2[Cu(4-Ph-pzH)4](µ-Cl)2}2− (1) and [Cu3(µ3-OH)(µ-pz)3(µ1,1-N3)2(N3)]− (2), crystallize as one-dimensional polymers, held together by weak Cu-(µ-Cl) and Cu-(µ-N3) interactions, respectively. Variable temperature magnetic susceptibility analyses determined the dominant antiferromagnetic intra-Cu3 exchange parameters in the solid state for both complexes, whereas the weak ferromagnetic inter-Cu3 interactions manifested also in the solid state EPR spectra, are absent in the corresponding frozen solution spectra. DFT calculations were employed to support the results of the magnetic susceptibility analyses.

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Manganese(II) Oxazolidine Nitroxide Chelates: Structure, Magnetism, and Redox Properties

Australian Journal of Chemistry ◽

10.1071/ch14390 ◽

2014 ◽

Vol 67 (11) ◽

pp. 1618 ◽

Cited By ~ 4

Author(s):

Ian A. Gass ◽

Mousa Asadi ◽

David W. Lupton ◽

Boujemaa Moubaraki ◽

Alan M. Bond ◽

...

Keyword(s):

Magnetic Susceptibility ◽

Intramolecular Interaction ◽

Variable Temperature ◽

Field Measurements ◽

X Ray Diffraction ◽

Magnetic Susceptibility Data ◽

X Ray ◽

Susceptibility Data ◽

Variable Temperature Magnetic Susceptibility ◽

Radical Interaction

The mononuclear oxazolidine nitroxide complex [MnII(L•)2](ClO4)2 (1) (L•, 4-dimethyl-2,2-di(2-pyridyl)oxazolidine N-oxide) has been synthesized and investigated using single-crystal X-ray diffraction, variable-temperature magnetic susceptibility measurements, and electrochemistry. The structural analysis reveals bond lengths compatible with a linear L•–MnII–L• arrangement where the ligands are in the neutral ligand form and the central MnII ion is high spin (S = 5/2). Although analysis of the variable-temperature magnetic susceptibility data suggests a strong antiferromagnetic metal–radical interaction, the radical–radical intramolecular interaction could not be determined unambiguously from such fits. The resultant isolated S = 3/2 ground state is confirmed by low-temperature magnetization versus field measurements. Electrochemical studies reveal similar square schemes and redox intermediates to the previously reported analogues [FeII(L•)2][BF4]2 and [CoII(L•)2][NO3]2.

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ChemInform Abstract: VARIABLE TEMPERATURE MAGNETIC SUSCEPTIBILITY AND X-RAY CRYSTAL STRUCTURE OF A NICKEL(II) DIMER WITH OXIME BRIDGING GROUPS

Chemischer Informationsdienst ◽

10.1002/chin.197630084 ◽

1976 ◽

Vol 7 (30) ◽

pp. no-no

Author(s):

Y. AGNUS ◽

R. LOUIS ◽

R. JESSER ◽

R. WEISS

Keyword(s):

Crystal Structure ◽

Magnetic Susceptibility ◽

Variable Temperature ◽

X Ray ◽

Variable Temperature Magnetic Susceptibility ◽

Bridging Groups

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Synthesis, Crystal Structures and Magnetic Properties of Mixed-Valent Tetranuclear Complexes with Y-Shaped MnII2MnIII2 Core

Magnetochemistry ◽

10.3390/magnetochemistry5010008 ◽

2019 ◽

Vol 5 (1) ◽

pp. 8 ◽

Cited By ~ 2

Author(s):

Masahiro Mikuriya ◽

Satoshi Kurahashi ◽

Seiki Tomohara ◽

Yoshiki Koyama ◽

Daisuke Yoshioka ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetic Susceptibility ◽

Crystal Structures ◽

Variable Temperature ◽

Magnetic Interactions ◽

Magnetic Data ◽

Schiff Base Ligands ◽

Tetranuclear Cluster ◽

Variable Temperature Magnetic Susceptibility ◽

Tetranuclear Complexes

Tetranuclear MnII2MnIII2 complexes with 1,3-bis(5-bromo-3-metoxysalicylidenaminomethyl)-2-propanol (H3bmsap) and 1,3-bis(5-chloro-3-methoxysalicylidenaminomethyl)-2-propanol (H3cmsap), [Mn4(bmsap)2(CH3CO2)3(CH3O)] (3) and [Mn4(cmsap)2(CH3CO2)3(CH3O)] (4), were synthesized and characterized by elemental analysis, infrared and diffused reflectance spectra and variable-temperature magnetic susceptibility measurements in the 2–300 K range. The crystal structures of 3 and 4 revealed a Y-shaped tetranuclear manganese cluster formed by the two Schiff-base ligands, three kinds of acetato ligands (bidentate, syn–anti-bridging, and syn–syn-bridging), and µ-methoxido ligand. The magnetic data showed the magnetic interactions among the four manganese atoms are antiferromagnetic as a whole within the tetranuclear cluster.

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X-Ray crystal structure and variable-temperature magnetic susceptibility of di-µ-cyanato-bis-[2,2′,2″-triaminotriethylamine]dinickel(II) tetraphenylborate; an oxygen-bonded cyanate

Journal of the Chemical Society Chemical Communications ◽

10.1039/c39730000411 ◽

1973 ◽

pp. 411-412 ◽

Cited By ~ 16

Author(s):

D. Michael Duggan ◽

David N. Hendrickson

Keyword(s):

Crystal Structure ◽

Magnetic Susceptibility ◽

Variable Temperature ◽

X Ray ◽

Variable Temperature Magnetic Susceptibility

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Preparation, electrochemical behavior, and variable-temperature magnetic properties of Co(3,5-DBSQ)2 complexes of imidazole- or pyrazole-substituted ligands

Canadian Journal of Chemistry ◽

10.1139/cjc-2014-0583 ◽

2015 ◽

Vol 93 (7) ◽

pp. 769-774 ◽

Cited By ~ 1

Author(s):

Carolyn Dowling ◽

Danielle R. Dinsdale ◽

Martin T. Lemaire

Keyword(s):

Magnetic Susceptibility ◽

High Spin ◽

Density Functional ◽

Variable Temperature ◽

Density Functional Theory Calculations ◽

Functional Theory ◽

Magnetic Susceptibility Data ◽

Valence Tautomerism ◽

Susceptibility Data ◽

Variable Temperature Magnetic Susceptibility

Herein we describe the preparation of four new Co(3,5-DBSQ)2 containing known 2-(2-pyridyl)benzimidazole 1, 2,2′-bisbenzimidazole 2, or 2,2-(1H-pyrazole-3,5-diyl)dipyridine 3. We investigate the electronic and variable-temperature magnetic susceptibility properties of these complexes. Complexes containing 2 and 3 are bimetallic and variable-temperature magnetic susceptibility data suggest observation of a stable intermediate (high-spin and low-spin) state for the bimetallic complex with 3, which does undergo valence tautomerism. Complexes 4–6 containing imidazole-based ligands 1 and 2 feature high-spin ground states and no valence tautomerism is observed in these materials. This experimental finding is corroborated with density functional theory calculations, which support the existence of a stable high-spin ground state in these complexes.

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